TIME: 3 HOURS
I riveted the two aft skins to the HS. Nothing exciting to see.
I was treated to a problem I couldn't solve without the right tools though...
There are four AN3 bolts (like the one at the top of the page) that hold each horn on. The two bolts on the front-side (seen -away- from you in the diagram), are shorter than the two bolts on the rear side.. Hence the AN3-4A vs AN3-5A. The "A" means that there are no safety-wire holes drilled through the bolt's head.
The fasteners on the front side are clear.. AN3-4A bolt, a thin -10L washer under the head .. then through the the horn.. through the spar and into the nutplate:
The fasteners on the rear side are more complicated. First, you need to find out what shim you need in between the spar and the horn. I had used some feelers, but it was easier to just try and see how many -10L "thin" (0.032") washers and/or -10 "thick" (0.063") washers i could slide underneath. I was able to slide only ONE -10L thin washer underneath. I tried two, as well as a -10 washer.. no dice.
Based on what size shim you needed to use to eliminate the play between the spar and the horn, then you have to figure out how many washers to put under the bolt's head. The total of the thicknesses of: shim + horn + washer(s) = between .220" - .255".
Simple enough right? .. we know the size of the -10 and -10L washers they are pretty standard.. and exact.. but.. what is the thickness of the horn? They mention in the example that its 0.056". Is my horn really that thick? My calipers were at home in a drawer. Bring the part home for the night.
I took several measurements around the holes of both horns. They were all very close to 0.059". Ok, now we have all the information we need.
The total build-up is: .040 spar + .032 shim + .059" horn = 0.131". Therefore, we need between 0.089-0.124" to bring the build-up into range. A -10 + -10L washer combo would be 0.095" .. thats good. How about TWO -10's? That'd be 0.126" and that's slightly over the acceptable range.
Not taken into account is the primer that is on the inside and outside of the spar. Its probably negligible, but it still counts for something... maybe 0.001"?
So its settled that we need a -10 and a -10L washer under the heads and the total is 0.226".
I riveted the two aft skins to the HS. Nothing exciting to see.
I was treated to a problem I couldn't solve without the right tools though...
There are four AN3 bolts (like the one at the top of the page) that hold each horn on. The two bolts on the front-side (seen -away- from you in the diagram), are shorter than the two bolts on the rear side.. Hence the AN3-4A vs AN3-5A. The "A" means that there are no safety-wire holes drilled through the bolt's head.
The fasteners on the front side are clear.. AN3-4A bolt, a thin -10L washer under the head .. then through the the horn.. through the spar and into the nutplate:
 |
| Fasteners on the forward side of the spar |
The fasteners on the rear side are more complicated. First, you need to find out what shim you need in between the spar and the horn. I had used some feelers, but it was easier to just try and see how many -10L "thin" (0.032") washers and/or -10 "thick" (0.063") washers i could slide underneath. I was able to slide only ONE -10L thin washer underneath. I tried two, as well as a -10 washer.. no dice.
 |
| Fasteners on the rear of the spar |
Based on what size shim you needed to use to eliminate the play between the spar and the horn, then you have to figure out how many washers to put under the bolt's head. The total of the thicknesses of: shim + horn + washer(s) = between .220" - .255".
Simple enough right? .. we know the size of the -10 and -10L washers they are pretty standard.. and exact.. but.. what is the thickness of the horn? They mention in the example that its 0.056". Is my horn really that thick? My calipers were at home in a drawer. Bring the part home for the night.
I took several measurements around the holes of both horns. They were all very close to 0.059". Ok, now we have all the information we need.
The total build-up is: .040 spar + .032 shim + .059" horn = 0.131". Therefore, we need between 0.089-0.124" to bring the build-up into range. A -10 + -10L washer combo would be 0.095" .. thats good. How about TWO -10's? That'd be 0.126" and that's slightly over the acceptable range.
Not taken into account is the primer that is on the inside and outside of the spar. Its probably negligible, but it still counts for something... maybe 0.001"?
So its settled that we need a -10 and a -10L washer under the heads and the total is 0.226".
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